Method of heating rotary cylinders by electricity



June 3 1924. 1,496,356

w. J. NOONA N METHOD OF HEATING ROTARY GYLINDERS BY ELECTRICITY File o 13, 1922 2 Sheets-Sheet 1 June 3, 1924. 1,496,356

W. J. NOONAN METHOD OF HEATING ROTARY CYLTNDERS BY ELECTRICITY Filed Nov. 13, 1922 2 Sheets-Sheet 2 o ziarneys.

Patented June 3, 1924.

UNITED. STATES PATENT OFFICE.

\VILLIAM'. J. ITOONAN, OF MANSFIELD, MASSACHUSETTS.

METHOD OF HEATING ROTARY CYLINDERS BY ELECTRICITY.

'Application filed November is, 1922 Serial 110. 600,627.

ingls.

he invention relates to an improvement in method of electrically heating a rotary cylinder or drum. The object of the invention is to heat the drum by means of electric heating coils which revolve with the drum. v

The invention may be applied to a rotary hollow cylinder, such as a roaster for cocoa beans, coffee, peanuts, or other purposes, in which it is desired to have the heat operativein the chamber ,of a hollow cylinder to roast the contents of the chamber,- in which case it is preferred to have the heating coils applied to the outer. riphery of the cylinderso as not to have t e coils come in contact with the contents of the cylinder or interfere with the smooth interior surface. The invention is also adapted to be applied to a roll or cylinder, in which the heat is utilized on the outer peripher such .for instance as a calendering roll. 11 such case it is preferable to have the outer periphery smooth, and, therefore, it is preferred to have the heating coils secured to the inner periphery of the cylinder. In either case, the drum being of metaL'the heat will pass through the wall of the drum'from the heating coils, either from the inner side to the outer side or from the outer side to the inner side as the case may be. L0 The invention will be fully understood from the following description when taken in connection with the accompanying drawings, and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification.

In the drawin s, Fig. 1 is a side elevation of a rotary circuit drum intended as a roaster embodying the invention, the outer covering of asbestos being partly broken away.

Fig. 2 is an end view viewed from the left-hand end of Fig. 1.

Fig. 3 is an end view viewed from the right-hand end of Fig. 1.

Fig. 4 is a view of a cylinder embodying the invention, the asbestos covering being broken and the mount being omitted to more clearly show the electric connections.

Fig. 5 is a section on line 5-5 of Fig 1. 1 Fig. 6 is a section similar to Fig. 5 of a modified form, in which the heating coils are applied to the inner periphery of the cylinder.

Referring to the drawings, there is shown at 1 a hollow cylinder closed at each end and mounted fast on a. rotary shaft 2, which is journalledin bearin 3, 4. The shaft .is driven by any suita le means. In the drawings, it is shown as driven by a motor 5 through a pinion 17 and gear 18. A plurality .of heating coils 6-6 are secured lengthwise of the shell on its outer periphery. The heating coils are designated alternately as 6 and 6. These heating coils may be secured to the shell in any suitable way so as to rotate therewith; for instance, they maybe spot-welded or secured by any other suitable means.

Each heating coil has a wire core surrounded by insulation to keep it out of electrical contact with the shell, as otherwise it would make a short circuit. The insulation, althou h sufficient to prevent the short circuiting, oes not prevent the heat from passing. through it to an outer covering or 'acket which encloses the insulated wire.

his jacket is a heat transmitter and becomes highl heated, thereby heating the shell, the 3' ac at being in direct contact with the shell. The details of this heating coil are not shown in the drawings,as a coil of this construction forms no part of the present invention. The shaft 2 is extended through the ends of the cylinder and has,

,13 and wires 13". In the drawings the connection is thus shown as made at the righthand and of the cylinder. The collector ring 8 is connected with the heating coils 6 by wire 14, wire ring 14. and wires 14".

At the opposite end of the shell 1, the

heating coils 6 and 6 of each pair are con heated throughout, thereby heating the inner periphery and heating the chamber within the shell. w

The temperature may be regulated by a rheostat or automatic temperature control if desired, but it is not necessary if care is taken to employ the proper number and size of heating coils for the work required. The contents of the chamber of the cylinder or shell will be tumbled about during the ro-' tation of the shell. The heatwill be maintained at the desired temperature and the rotation will be continued for the requisite length of time according to requirement for the particular kind of goods being roasted. Suitable doors will be provided to permit access to the interior of the shell to intro-. dues and to discharge the material to be roasted. I A. suitable switch 16 is rovided for turninthe current on and o he shell is preferably wrapped with .a covering of asbestos 117 to prevent the ex!- ternal radiation of the heat from the cylin- In the modification shown in Figure 6, the heating mile 6, 6 are secured to the inner periphery of the cylinder, the current being transmitted to the heating coils through wires which pass through the end of the shell to the heating ceils on the inside in similar manner to that already described for the heating coils on the outside. In this way the outer'surface of the shell is left entirely smooth. en used for calendering purposes, the asbestos covering will be omitted. ile I have referred to the rotary shell as being a cylinder, I do not intend to limit the c aims to a device which is of strictly cylindrical form. It is obconfig ration.

e I have described one method of electrifying the heat coils, I intend to claim broadly a rotary shell having electric heating coils attached thereto whatever may be the particular method of passing the current through the heating coils. v

Preferably the cylinderwnen used as a 1,4ee,see

roaster has its journals mounted on skeleton framework somewhat above the floor, so as to afford a space on the under side for other mechanism connected with. it. As

shown in the drawings, the bearing 4 at one end for one end of the shaft is mounted on a standard 118, and the bearing 3 for the other end of the shaft is mounted on a shelf 19, which in turn is supported by .the two standards 20-20. These standards 2020 are spaced apart from each other and at- "ford a clearance space under the cylinder for a car 21 into which the contents of the cylindrical roaster are to be dumped when sufliciently baked or roasted. The roaster is provided with a sort of a hopper 22 which is in the position shown in-full lines, Figure 1, when the cylinder is set to receive its load through a chute 23. When it is desired to dump the contents, the hopper will be turned into the dotted line position, as

shown in Figure 1, so that the contents will fall into the car 21. Preferably the car is the contents of the car after the beans or other contents of the roaster have been dumped into the car. s

If the smoke and chafi" is left any length of time in the beans after they have been roasted and dumped into the car the beans will become impregnated with the bad flavor due to the smoke and chafi which will afi'ect the flavor of the bean and of the cofiee or cocoa which is made from it. It is important, therefore, that the chafi and smoke should be removed as soon asipossible. That is the reason why it is important that the suction device should be connected u with the chamber below the sieve 24 while the car is in position beneath the discharge chute from the roaster so that the suction device may be put into operation immediately after the beans are dumped from the roaster into the car.

What I claim is 1. In combination with a rotar drum, an electric heating medium mounted upon and rotating with said drum, means for electrifylng the heating medium during the rotation of the drum, a rotary shaft on which said drum is mounted so that the drum rotates with the shaft, means for rotatin the shaft, standards in which said she. t is I mounted in such manner that the drum is held elevated at some distance above the surface of the floor on which the standards rest and having an open space for the free entrance of a car to a position beneath the drum and the withdrawal of the car at will,

and a suction device which, at will, may be connected with a car when positioned under the drum.

2. In combination with a rotary drum, an electric heating medium mounted upon and rotating with said drum, means for electrifying the heating medium during the rotation of the drum, a rotary shaft on which said drum is mounted so that the drum rotates with the shaft, means for rotating the shaft, standards .in which said shaft is mounted in such manner that the drum is elevated at some distance above the surface of the floor on which the standards rest and having an openspace for the free entrance of a car to a position beneath the drum and the withdrawal of the car at will, a car provided with an open top and a closed bottom and a reticulated false bottom at some distance above the real bottom thereby forming a chamber between the false and real bottoms, and a suction pipe standards in which said drum is mounted in such manner that the drum is elevated at some distance above the surface of the floor on which the standards rest and having an open space for the free entrance of a car to a position beneath the drum and the withdrawal of the car at will, a car provided with an open top and a closed bottom and a reticulated false bottom at some distance above the real bottom thereby forming a chamber between the false and real bottoms, and a suction pipe, which, at will, may be connected with said chamber below the reticulated member when the car is positioned under the drum.

In testimony whereof I afiix my si ature.

WILLIAM J. NOO AN. 

